tell us what you can about the explosion that shook all of us yesterday. >> it is a remarkable failure because it really shouldn't happen, given all of the protocols in place and all the things that happened to have such a fail-year you wonder. with such a catastrophic failure somebody punched a hole in one of these mains and caused a spark but that doesn't appear to be the case here. something failed in such a catastrophic way that the valves are maybe a mile, two miles apart so now all of this highly compressed gas which is under several hundred pounds of pressure per square inch is venting to the atmosphere. it catches on fire. it becomes a blow torch. it has to work out and while that was happening it was burning up that particular neighborhood. generally speaking, we don't know really what happened. we know there was a significant failure and generally speaking has been my experience in covering all kinds of disasters it's a chain of events rather than a single event but there is plenty going on that raises questions. one of which was, conversations by several people who said prio